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Can someone tell me what I am doing wrong here, please?

wtf.rb

require 'minitest/autorun' class MyPlugin def self.valid_plugin?(plugin_class) begin plugin_class.ancestors.include?(self) rescue NameError false end end end class MyPluginTest < Minitest::Test def test_valid_plugin_handles_missing_constant assert_equal false, MyPlugin.valid_plugin?(MyMissingConstant) end end

Environment

$ ruby -v ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0] $ gem list --local *** LOCAL GEMS *** bigdecimal (1.2.4) bundler (1.7.3) io-console (0.4.2) json (1.8.1) minitest (5.4.2, 4.7.5) psych (2.0.5) rake (10.1.0) rdoc (4.1.0) test-unit (2.1.2.0) $ ruby wtf.rb Run options: --seed 32486 # Running: E Finished in 0.001228s, 814.3322 runs/s, 0.0000 assertions/s. 1) Error: MyPluginTest#test_valid_plugin_handles_missing_constant: NameError: uninitialized constant MyPluginTest::MyMissingConstant wtf.rb:15:in `test_valid_plugin_handles_missing_constant' 1 runs, 0 assertions, 0 failures, 1 errors, 0 skips
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1 Answer 1

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MyMissingConstant is evaluated before the valid_plugin? method is called. You have to either rescue at the call site, or pass a string and look up the constant within your method.

Kernel.const_get is probably the simplest way to do that. For more detail, look at question slike this one:

How to convert a string to a constant in Ruby?

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